Acharya Vamana (latter half of the 8th century â early 9th century) was an Indian Rhetorician.
Vamana's investigation into the nature of a KÃÂvya is known as theory of Riti.
Vamana's Kavyalankara Sutra is considered as the first attempt at evolving a philosophy of literary aesthetics. He regarded that riti is the soul of Kavya. He presented his formulations in the form of Sutras.